磺化-离子交换树脂法测定重烷基苯平均相对分子质量

介绍了一种重烷基苯平均相对分子质量的分析方法。重烷基苯在（55±1）℃用20％发烟硫酸进行磺化，磺化产物中和后用阴阳离子交换树脂进行吸附，根据吸附的结果计算出重烷基苯的可磺化物含量，再用海明溶液滴定磺化生成的重烷基苯磺酸盐，根据海明溶液的消耗量计算出重烷基苯的平均相对分子质量。结果表明，该法简单、快速、安全可靠，可用于重烷基苯平均相对分子质量的测定。

Determination of Average Relative Molecular Mass of Heavy Alkylbenzene with Sulfonation-Ion Exchange Resin Process

A method of determining the average relative molecular mass of heavy alkylbenzene is introduced in this paper. Heavy alkylbenzene is sulfonated with 20% fuming sulfuric acid at（55±1）℃, and the sulfonated product is absorbed with anion and cation exchange resins after being neutralized. The content of the part of heavy alkylbenzene that can be sulfonated is calculated based on the results of adsorption. The heavy alkyl- benzene sulfonate produced in the sulfonation process is then titrated with Hyamine solution, and the average relative molecular mass of heavy alkylbenzene is calculated based on the consumption of Hyamine solution. Results have shown that this determination process is simple, fast, safe and reliable, and can be used to determine the average relative molecular mass of heavy alkylbenzene.